Multiple Choice
During which phase of a muscle twitch does calcium bind to troponin, initiating cross-bridge formation?
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4. Tissues & Histology
Introduction to Muscle Tissue
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which muscle fiber arrangement is characteristic of the pectoralis major muscle?
A
Parallel
B
Pennate
C
Circular
D
Convergent
Verified step by step guidance1
Understand the concept of muscle fiber arrangements: Muscle fibers can be arranged in different patterns, including parallel, pennate, circular, and convergent. Each arrangement has unique structural and functional characteristics.
Define the convergent muscle fiber arrangement: In a convergent arrangement, muscle fibers spread out from a broad origin and converge to a single, narrow insertion point. This allows for versatile movement and force generation.
Identify the anatomy of the pectoralis major: The pectoralis major is a large, fan-shaped muscle located in the chest. It has a broad origin from the clavicle, sternum, and ribs, and its fibers converge to insert on the humerus.
Compare the pectoralis major's structure to the convergent arrangement: The broad origin and narrow insertion of the pectoralis major match the characteristics of a convergent muscle fiber arrangement.
Conclude that the pectoralis major muscle exhibits a convergent fiber arrangement based on its anatomical structure and functional design.
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